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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81305f0b7c0eed202ad557c32d08c54df830cff5611982f64d3aaf842bd5106d' 
  AND token = 'xHdcP3apeDsehPsIU7y0mc0JfxrV7vfSmbqaTfhmS9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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