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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b398aceb190e7dc65105649b2e55dc794a2780abdbeac76b611f7d86d2573ae9' 
  AND token = '1WsZT5fwNllW0wbZaFceZ/mGzWnfZgdpaL5tUx1pyKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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