SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac595023283d3829b1747b76789344061a7eedcde08cf6fd266bfd48caa80ac2' 
  AND token = 'd2zmNlibCqSrjx9AcUhxkffH5KdKLaWwJvkjmqLR1og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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