SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b67b355ee3d8b71605d02785974ae5a9f2396683f9e7aacfbc403e71c608968' 
  AND token = '+D6hYSf3xe0Mq3BfcVzWLssiPdDV/LdY0vUjxBQgYUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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