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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '020054e4a9a6ae4ad05f476ea04195ae5cc425fe0d6684240985bb86d10cfe28' 
  AND token = 'wr2t/NjVtDfHhfaeFTB3qNHl+VjtT9qvpQAFq9pAm9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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