SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9b3466b0826ba783341a9f308b67f023d82ec624881b5540293dc578c958f27' 
  AND token = '6GEjcWVaBadIBvMqJWsV2GIgz83WQry4M7lAsvwMDLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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