SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b61268f9781b54aa188f477c941d43b640bee837e89bb4e1897b1ccb6126d4d3' 
  AND token = 'Lav+KHFg1nnWY2Kokg9GbjNja+LzJmdX1FihhLXLeFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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