SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1d682408b8d9be5acc659f8f228645c89217112b2769c51ae7b515fd1f1afd6' 
  AND token = 'VT/o7GZaNk+UejssJgaE6vcf3W3Ye7ztc3NDwn+Sm78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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