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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bccc6fac3d4173e43ba940da44b9c5830e94f84b9c5e94033eb46d422a81b1a4' 
  AND token = 'UivErY1ed8AF+ka+hlTIWXrR3n+7vQmxu3hGNB9WNqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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