SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '211f008291c1248f7e4782ad1663878737f0b05f516aa7e62e717c1700b6a822' 
  AND token = 'X9qfv0lMQvVHhLYw2KMJ/CxUMSHKbnWRO9J24NfE3VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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