SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48266d5e8c775315821db103789a409f2ada4cedbbeb6dc0f87445e215db604' 
  AND token = 'SS/rTfl2bcZNfiRl0pe1OqWzDBvQhg7CGxJ8sVIQuaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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