SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b13c28f37002890e9def174743b6284f59ad7cbac0eb24ab5886f0b1705ebc51' 
  AND token = 'Vh9ZPp/tKfThcpxp386VCFt3dXmQDAFntcmBz6h7GSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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