SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0083ef6670c2f5dc77f000bf4c8f54488d0ba580fb17f89439ed951db2532983' 
  AND token = 'qjev1ZNW6EPIjtHOSJ2SznjKKTnNXjQ9oqyk/IzT7xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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