SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0828c45c0cbd942663f94349a178a3ea27e6abd2080e65f5755f0705258a4817' 
  AND token = 'fXtUzXQc7m2vmyi1FTKh/IJr914jMRYjqm1l+V8cxwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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