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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe39b19f93a68ad78ec40b5067f025bf9fa1f2e4540280c61ad670795eb1c55f' 
  AND token = 'IBHBiFsx0+bIN08OFdm7czMbO3dQBDpGpwNnE3++bhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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