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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f01333008c42c9ad41ee824e9f32d892e7d68495d0ccd1e923eaa707f6af585e' 
  AND token = '4WB/JFc6qszAdXd8CjqK0eMv/4eoy3x41D+GNloWK98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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