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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '905a3ddee0dbb855c12b72f3d46de3f8533e6b06648b0c76832f958c3c450e7d' 
  AND token = 'MBMJH5SHJcJyiFgvGngLHkUwceHTcOwb2mq7TWgNw3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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