Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acc5ba593f4a2b15cc9d6499af1912a0dec05a9fa7e0d7e16876cb061d5670f6' 
  AND token = 'Ui8dv+WvKt7UVqH70T5xbY+kxujkibimf2Fp6azQ/vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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