SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffdf9633ff6876ed11bd389b00da52434485ccfb876cf2a30300a198902cbadb' 
  AND token = 'J6DWbawnyJvZohvEpFr41O1XS/lzeCmTyVOCSCSrvjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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