SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7830154d8506f95b6333c91681f97b9c94f641094578a90e17cb13c3f524791b' 
  AND token = 'GNqSSVgPdgLbjkV0GFCCb/zQbWIXdg80MVtJz+TemaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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