SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e88c7057ce6f65203178f170b096a3950bb3804d517ab26971a067db011c508' 
  AND token = '+4D5futJ4z2lGGQNH7J7b2vMyGMXWX8UYZRnfjSdZlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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