SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a11f7eeb41ae32e3a8587bcf243660004bf7b51b4573251a816819f7f7630a2' 
  AND token = 'wF4FbrnpymbUoWeVzHCBihMw/JO5AydZ/T9s7gm0Xio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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