SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8ba4f98b14e133129d77a50a4f5df92f9247c60ee0493dda5781c82181d5570' 
  AND token = 'beLhe2M8DcGhXWjCnLZEMyNgLbEw/olHFEDvRkz1Y5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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