SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86404d12fb0cda30373e35fe58f375526af8f8fa6a79be434781b3526fa59ef5' 
  AND token = 'OmIxggFgVB6gU7XlmDx1+cZnrSpQLnY6F1Gket3+d3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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