Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd94678c4584d4cd2931ebaf74c8a97ef70d5f588d94e81218dcd445fffa456a4' 
  AND token = 'AGJeJOiYpLgonnU8AtXj2nnLAG0uQV1vNFvoQzYDYc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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