SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef1ba675f4043abd966a612d1d520e1d48a39b7cf9551ceac913611172507de0' 
  AND token = 'bn3vv6FpLaC9WkGbJSthB48/TYVdKVHJBOefvRHRpV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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