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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fcef3ca695440724b7fe6c36621acb976c30d7ffd8a4f423601c4298899f397' 
  AND token = 'fwk5T5Z1NB86ygG0uVLElTIJpLE7CNvkSnt1pV3nqfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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