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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '689ef81b19458cfdc84de770edc673d67aba89eea3f1164cf00df65c8f418440' 
  AND token = 'Ws1BMoVUl4RI69mffIDXBAW7RQq0jMBGycEMACwWMX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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