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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43eec5b2f6dc8f3551a9a6047d7bd00f857896f46694734208ab75eca8b4bb96' 
  AND token = 'lfh4QmBfzdO89FUEx15dv8Ykuh702AScUwix1a5TCO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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