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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38df5908cb1a9b0949dce0e618f0fe9f0a25b0f6db49169d3afab7a3fb1e4e21' 
  AND token = '+fNwEsI6DU6Uu52++O0LNZhD/kThMtldapyUXAKTJds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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