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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80f7531f927ec24df645a8edd66537d9e98faa1f794f4d3786178541948ababe' 
  AND token = '4gRnPymaKiZQgmS6Y2Ayd9vRoStT24Qzgs7s/Bj9AQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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