SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0f046e592850d71a84295e1fe5c1b4990ecc02d583a613b52d0d16f702f89b0' 
  AND token = 'PI2ARq7SZvHfV9wvV+q42WAUUlLA2D9AIUXy/j3zC3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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