SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c24a91f3d1ccb69045611e120aef7dba976b8879858aa12ef6710852bdfd5fe' 
  AND token = 'EBWuVYF7mkjz+VLu+TD+pCkI2Mo6L45a30DZWJMvvg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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