SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd74672fa51dce3b8038f35027f15dc543f35e107d4f0d6429977d097fd2d63af' 
  AND token = 'uc6y5t3RYj3NqLpwqQ7ZclcJGgFGzRU1WmlsvEE3KrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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