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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edf96b7e24109ce73bfe2ea585cf9339ba56195c13e5eebd8ddc7f017fb762eb' 
  AND token = 'MQ9hTm1UusXHz6Qcfw63MQTPhoB56hEIBep5zZRjc98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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