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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c2c387a1d4c9cfe4e35f915d79073828b8b64f0829dd828d91c7ad4a937aeda' 
  AND token = 'GFl1DQbxHmDEXKeYLG8dEY0GZOhYP2xMuvMbO7wDM2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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