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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e396ed327a8d052c1eeb255035573e87aaf48a2055606cb8bdc4ef86d698c7dd' 
  AND token = 'CP61b2+CXOvMJ5gUsCmM+xyt1vuVvxlXGc2iP/A+mWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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