SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '469f89878438b4d1042ee0006440f11761fd1191845cdce80d76200e1f382cdc' 
  AND token = 'OF3TzFEXGbXQ2SGAwCWjxtwxCxZjKHBwYPrRw7ZTBpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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