SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0191be6eb2d5a02190120d0c0b413137bf8cc4fe118c36654d6897612f9a94b0' 
  AND token = '35m/QWbq3J1XoNDABwBRBFdjhWKT4ftq06HQ4XLCWug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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