SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6d460fc80c5a11a3d10732b1735ceb974092e5d6a483993a16d5d42987882fa' 
  AND token = 'BboEoDjhJZfCHoPp79BA1X9qK/jzT+C9+KtrJxFlLjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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