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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bca9dcf48cd4bd0e62dc65d6e170110dac4862f571952adf5bad4a2556ff0f21' 
  AND token = '4C6daJ8/XWPfxZmeXG07vb74ZJhT8WaVYdFbBPBC7eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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