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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93bf4a4ea294b321a6109dadbcb9fdedf70b2bd3cb3886c5443d4e4798abf690' 
  AND token = 'Gx+mcOvDvc7WxR5nxFPfSbsBzs2409VoC8FkKO+VrDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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