SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1122b726b61ccf8d42afc99edee594c4abd1c8504e12ac2978f26b070f177804' 
  AND token = '3kBvKi7BCKVD35RzY1yWo2UFEPmwW8vk+2vUqBl5Pts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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