SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '698ef85df036442719ba958671f36d500e79f0ca1323f82f00a3d2f2ed8b746a' 
  AND token = 'YJ/tTLyA9JxCszmkXJEQFJAOy0F7M3BeGlY88XLW8vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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