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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edd48a5b9fc612b2d645e29cc8aa16e3a434707991afb4479dfcd6cf6ee937c9' 
  AND token = 'oyczzcfn1Qidq9oz5svpcUdlSv88EihgNFW7cJR1OZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}