SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fa3e9b19115d9ecac35d177b5a743784677fbf4f0315abad65c94dd72963fc0' 
  AND token = 'vbbbJWqV2jR33hMsaGuGWFxggeLHGHdTLJKCj123hdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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