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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2837821265b7721c1c161417720c3b5673ec4b8fc95c8fe925714ad7f8a9ed8a' 
  AND token = 'H+GTTh++MhE0r3QehPp5M42+VbZx3qm9QgbakisLODc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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