SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d81cea5cce3d8b4e361a6e3036b1a256ab3384df6fb265b0c584cd372fa5374' 
  AND token = 'W8mu5PBdTvkO/VCCkgfxB2e/fKVlyoG9Iyub3Z+JW+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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