SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d7114492ba109e55026c7c6f1c34b0a08b6d04208d24d4da7b304d3366584ab' 
  AND token = '5XPgdufraQGcUKNrNFvPOTsuZEXvROU6N1Yz7Wchwnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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