SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af611524ac13d8a1b8d74b733d10ce154c5ed88639f9ffe5eab98771b522049e' 
  AND token = 'QPSpnY/fQAiS8BGeuLZ824iXLfPvy8A6FfiqEmmJjIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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