SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e53674242dead9fb96933a2efee841d883d911a88638133b41fc597977b35399' 
  AND token = 'GxdXqkg/g3zOBsqidV3WD/yvzK+ni19Wk76BHHuqsyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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