Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0761c725fd529e15a8fec25c4a28ecfb6bd7dcb03b6e58b3ee2f5270833b686' 
  AND token = '4XprHcLOBdtS8vrTm55KCiPFTDSoT+FT1a5KlZnTH/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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