SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6772ccc83351d4a7ef124c0d95464328ab236b43c7486b2f9eeb408c13bf0a89' 
  AND token = '9B2AqlEPjhA45zN5LnfuyhWgUZOLMpNonQRGNzXcUDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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