SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfe53d69bcc1c0602f7e860196ee9dd70d8bd6592b8f7b93d2804dfe78993449' 
  AND token = '9zVHRS5wkcrALmXuLlUniazPqmZDxjqM1axaJICMVUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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