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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b28cfecc8c0a8fecee10adbc5d7aeafcbd2ea81a47f3d03d9a76f83f29368cc' 
  AND token = 'txrSXIv8bkv2mKI8nV96OI+6yF3J4wfybW0xKbhBWBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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