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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d18713b2dec74ca3c6d68ebafd480809a47af4cf0472688a2d48681dfe4de8c' 
  AND token = '3WJMgNMTOjsLputQ4LrfkljUpCHwmcV2KFvVsooeY0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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