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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba224b8790d373ae81eede35304c37f841dcc9b70c123a689dc0c425ea57dc79' 
  AND token = 'AAjF4q+DR+Qn6mOF8c/VuiqJVZJSPyd+haIuxn28V5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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