SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40b58d648f7ab94b2dc18bb5eb2ce4a9915794013f2dae1ec455167eb9a133e7' 
  AND token = 'cgGu+XJL6/WJmyPR6L9CwlJYJdySCPTukhNEGh8K1ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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