SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '283d0e550487d901df026c9fe4cdea6743ee8c56c1c491fcdb8fcf0b474428d9' 
  AND token = 'CqCyFVNB5kvSjGf7CiMiAW+0ngXRli7X9Jih1XRJHbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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