SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad215f35c90cf854f07d7bdaa3e1d1ce6407825539f58feea780159ac4ea15d4' 
  AND token = 'hVMYvFImjD/o2viY2RTTAnOjlBdeRaxwrqsjQ9UrkgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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