SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddeb6a2fa48027258a1260874595a66b697e2bcd51c732500f19f2236cfd26f4' 
  AND token = 'KkiTkZ+osvk1A3DSgC+kdw0AND8B+0HZQaQqBFgWfVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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