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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88c8cec78ca311f80c0ef954ecdef5563b4120787e7b055a5a47f586a0555d7d' 
  AND token = 'ow+vpf5sq5560u/XUhEwK1sPJtiXjjWa3iI4Kv20XX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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