SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac8850906875a54d139e0f3e67036d5862a7c766576d94dd7722253a101ca65' 
  AND token = 'CilvEKRkOyYBlUvTr1PZbY5Ko/sGF//hqHeNLSmORJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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