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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25a1f5b3def3de1f1ed203c776ae011da5151aae221e3048e0aac669c98f976b' 
  AND token = '8KT+TBiooZK2mX8q7EjsbMQvTUW0orgTGha1GhZS2nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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