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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a16711fc3ddee990a88b33755da790c2ea6e3986735cf6775827a6d8f78b9926' 
  AND token = 'orQiq7X9c2GglcvHkDCcRrzgZHPPllpUR9SvWXGUewQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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