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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05705ff431affe1cd87e49d3a3ef1ca2b53036f98eb34b0266928c91b5344ee4' 
  AND token = 'n30vLBagqtrigr0D+GvJ72ex8n8oJ+df90Mih0ZHHAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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