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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9883b9b31c8a68153fc952c57a385dad0d7ef5c5f42d07992f02917d53e525ff' 
  AND token = '7smUJqbgfc0XEeDo0YYgiXH5GkaaDXAchddt9yA87zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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