SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bc2381774b684920d8aa21c17ef03469c3ec5ad2c5b10cade758f01e2f38266' 
  AND token = 'V5uB4z4nWSx/htPngJWNL10JM0ICsIxm8EenB2vGkTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00184

JSON explain

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