SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '647c07b2c66b015afd3a74ead5d9ed4d0d716883efcdab07d7686bf9a9675b20' 
  AND token = '/bWSPL6cOgzsP4n1jI4BvFcPBq1lrvnjjqY/FGNq5sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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